Actually I'm not sure if devices are powerful enough to do this easily today. The image processing to do OCR and a number of other things they likely do to get

Actually I'm not sure if devices are powerful enough to do this easily today. The image processing to do OCR and a number of other things they likely do to get it right (they likely have a different OCR engine for every language, so each image would be done a number of times to determine which language OCR'd the best). along with that The storage issue you mention and then also likely a ram issue are the biggest factors. I'm not sure that this can reasonably be done on a phone still. Now a modern laptop could likely handle all of this, though it still wouldn't be as useful as if your phone could do it on it's own.